package com.kaoshi.util;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Utils {
	
	public static String getMD5Str(String str){
		MessageDigest messageDigest = null;
		try{
			messageDigest = MessageDigest.getInstance("MD5");
			messageDigest.reset();
			messageDigest.update(str.getBytes("UTF-8"));
		} catch (NoSuchAlgorithmException e){
			System.out.println("NoSuchAlgorithmException caught!");
			System.exit(-1);
		} catch (UnsupportedEncodingException e){
			e.printStackTrace();
		}
		byte[] byteArray = messageDigest.digest();
		StringBuffer md5StrBuff = new StringBuffer();
		for (int i = 0; i < byteArray.length; i++){
			if (Integer.toHexString(0xFF & byteArray[i]).length() == 1) {
				md5StrBuff.append("0").append(Integer.toHexString(0xFF & byteArray[i]));
			}else{
				md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
			}
		}
		return md5StrBuff.toString();
	}
}
